Personally, I don't think lighting is the issue. If the algae is indeed Oedogonium, as it appears to be, then the issue is low CO2 and low nutrients. That's why I asked you to detail what you dose, how much you dose, and when you dose it. Every now and then there is a misunderstanding of the EI charts so it's best to go over those details to double check that area.
I am in agreement regarding the CO2. Kathyy is spot on regarding the 1 degree pH drop as a general measure. Since you don't have a drop checker, you can use that as a rough gauge. Since you described seeing actual CO2 bubbles in the tank, it appears you're using a diffuser. Your flow and circulation sound very good, but it does appear you need to increase your CO2. Also, I'm wondering if the CO2 is being pushed on the outer edges of the tank, but not migrating to the middle portion.
Continue increasing the CO2. As you approach a 1 degree drop in the pH, be sure to watch your fish very closely, especially at night. If you see any signs of stress (gasping at the surface), lower the CO2 a notch. You can do a water change to help the fish. That one notch lower setting on the CO2 then becomes your final setting. It is the highest you can safely go.
Meanwhile, get some H2O2 (regular drug store 3% hydrogen peroxide) to kill the algae. Use no more than 1ml per gallon, so in your case, that would be 29ml total. Turn off your filter and use a syringe to squirt the H2O2 directly onto the algae. After you've used up all 29ml, turn off your lights and wait 15 minutes. After 15 minutes, turn on your filter, but leave your lights off. Wait another 15 minutes. Then turn your lights back on. You can do a 50% water change if you want, but it's not necessary (H2O2 breaks down to water (H2O) and oxygen (O) which is harmless). You should see lots of fizzing where the H2O2 hits the algae. By the next day, the algae should show signs of death, and within a week, it should be melted away.
You can repeat the H2O2 treatment every day until you've killed all the algae. And as long as you have corrected the problem that allowed the algae to grow in the first place, then the algae should not return.
So: (1) confirm fert dosage, (2) increase CO2, and (3) kill algae with H2O2. Hope that helps.